Question

what is the lines slope?

Explanation:

Step1: Recall slope formula

The slope formula is $m=\frac{y_2 - y_1}{x_2 - x_1}$, where $(x_1,y_1)$ and $(x_2,y_2)$ are two points on the line.

Step2: Select two points

Let's take two points on the purple - line, say $(-6,-3)$ and $(6,-3)$.

Step3: Substitute into formula

$m=\frac{-3-(-3)}{6 - (-6)}=\frac{-3 + 3}{6+6}=\frac{0}{12}=0$

Answer:

$0$